/*
 * MIT License
 *
 * Copyright (c) 2020 wen.gu <454727014@qq.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

 /***************************************************************************
  * Name: mp_worker.h
  *
  * Purpose: thread wrapper implementation for micro player
  *
  * Developer:
  *   wen.gu , 2020-08-04
  *
  * TODO:
  *
  ***************************************************************************/

#ifndef __MP_WORKER_H__
#define __MP_WORKER_H__

/******************************************************************************
**    INCLUDES
******************************************************************************/
#include <functional>
#include <thread>
#include <mutex>
#include <condition_variable>
#include "mp_types.h"

/******************************************************************************
**    MACROS
******************************************************************************/


/******************************************************************************
**    TYPE DEFINITIONS
******************************************************************************/

using WorkerHandler = std::function<void()>;
/******************************************************************************
**    CLASSES/FUNCTIONS DEFINITIONS
******************************************************************************/

class MP_CLASS MPWorker final
{
public:
    enum class RunState : uint8_t
    {
        kStopped = 0,
        kRunning,
        kPuased
    };

public:
    /** default state of worker is 'pause' */
    MPWorker(WorkerHandler worker);
    ~MPWorker();

public:
    void resume();
    void pause();

public:
    /** return false: keep running, true: exit thread */
    inline bool isTerminate()
    {
        AutoLock al(mLock);
        while (mState == RunState::kPuased)
        {
            mCond.wait(al);
        }

        return mState != RunState::kStopped;
    }

private:
    RunState mState = RunState::kPuased;
    std::thread* mThd = nullptr;
    std::mutex mLock;
    std::condition_variable mCond;
};

#endif /** !__MP_WORKER_H__ */

